Silica analysis report revision, Residential Sampling Project, Dec 2001

NYC 9/11 Public Portal Document

J07 Haddon Avenue 4fMSL EMSL Anafyticalj Inc,' J^estmant, HJ. 08108 (856) 858-4800 12/7/01 Attention: U.S.EPA BQ Financial Services Division 1200 Pennsylvania Avenue NW Maildrop 27.S4R Washington, DC. 20460

Project; Residential Sampling Ref. Number; 360100035 Revision 120201

Crystalline Particle Analysis Performed by X-Ray Diffraction (XRD) Silica Analysis by Method NIQSH 7500 Nuisance Jlust Airborne Analyte Sample Sample Analyte .Aniilytc % Analytical Wtlght Cone Weisht Cone. /tnahle .Scfisitiilfy Sample ID Identification Particle ID Volume (■ng) (mo/m’) (mgj (mg/m’) (mg/m’) (L) ______

(RJIF-O-IO Quartz 1225 0.411 0.335S <0.004 </lS N/A 0.0033 Crisrabalile <0.012 <AS 0.01 S4 Tridymite N/A N/A N/A Calcile <0.004 <AS 0.D051 Portland/ Umc <0.02 <AS 0.0256 Gypsum <0.004 <AS 0.0051 Mica <0.011 <AS 0.0141 Halite <0.006 <AS 0,0077 Fibrous Glass N/A N/A N/A

(R]RF.C-10 Quartz 757 NZA N/A <0.004 <AS WA 0.0053 Criatcbalile <0.012 <A2 0.01S4 Tiidymnc N/A N/A N/A Calcite <0.004 <AS 0.D0S1 Penland/ Um© <0.02 <AS 0.0256 Gypsum <0.004 <AS 0.0051 Wioa <0.011 <AS 0.0141 Halite <0.006 <AS 0.0077 Fibrous Glass N/A N/A N/A

(RITF-C-10 Quartz 148I 0,073 0.0S81' <0.004 <AS WA 0.0034 ■Cristotialite <0.012 <AS 0,0154 Tridymite N/A N/A N/A Calcile <0.004 <AS 0.00S1 Poriland/ Lime <0.02 <AS 0.O25E Gypsum <0.004 <A3 0.0051 Mica <0.011 <AS 0.0141 Hallie <0.006 <AS 0.0077 Fibrous Glass N/A N/A N/A

John Neviton 2S Nwemher, 01 Analyst Date of Analysis Disclaimer: The liiboratory can only verify the cuDcentraiion ofsUici onthe filter and not the &iil concentration due to data obtained by nonJaboralory personnel. In die ah.tencc of a bulk duct sanple, the specific form of cryrtaHuic silice can nol.be ddantiined. Hence. alpha-cjuarU, tiic moyt, pre«Jent form of cri’StJIinc silica, will be iisaianci = Less Aun ihc .ruxcct value ■file lowest reportable Value is cquivalerttetlit .ArudyticaJ Scn.siliv'ity whidi is Ciilculatcd from the lo'o.’z.rl reproducible concenlTation of silica detectable by die innrunwnl. .AlIUA Aocrediled - Laboratory ID if 100192

CONFIDENTIAL, CITY_21MC100_003434007

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176077